Hi, I've never seen this expression abbreviated. ' Best wishes, Clive
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the symbol of the apostrophe is used to denote possession or missing letters...(of course, we all know what that letters mean, but that is presumptive)...therefore it should be t's and c's (capitalised and/or the "and" substituted with the ampersand sign)..because it is not a possessive nouns, merely a shortened version of two words